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fix: repaint per-column fill for spanning cells in frozen trailing rows

`walkRowsInCol` does not clip scrolling rows at freezeY, so the last
visible scrolling row's y-range crosses into the freeze band. Glide's
normal flow relies on each column repainting the frozen row's fill after
the scrolling walk to overwrite that overflow. With a wide `span` this
short-circuits via `handledSpans` for every column after the first,
leaving scrolling-row content visible inside the frozen span; per-column
selection/highlight accents were also skipped for the same reason.

Fall through with `skipContents=true` for sticky rows so each column
repaints its own fill. Content stays drawn once by the initial span push.
Non-frozen spans keep the short-circuit — they don't hit the
overflow-into-freeze-band issue and rely on the wide-fill column for
highlightRegions.

Adds a regression test that fails without the fix.

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